Screw-driver



y B U flu 0. B p i f W l\ u H m SCREW DRIVER.

INVENTOI? 2-42524 ATTORNEY.

F. GHANTRBLL.

UNITED STATES PATENT Fries.

FELIX CHAN'IRELL, OF READING, PENNSYLVANIA.

SCREW-DRIVER.

SPECIFICATION forming part of Letters Patent No. 393,420, dated November 27, 1888.

Application filed March 19, 1888.

all whom, it may concern:

Be it known that I, FELIX CHANTRELL, a citizen of the United States, residing at Heading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Scre w-Drivers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to the manufacture of small 'toolssuch as the screwdriver-which are constructed, essentially, ofa shaft or blade secured to a wooden or equivalent handle; and it consists in an improved method of uniting these elements, so as to form a neat and substantial tool at a small cost.

Figure 1 represents a screw-driver with handle partly in section, so as to show more clearly the end of the shaft. Fig. 2 shows the ribbed, sleeve detached.

A represents the handle, which is bored at its small end to fit the body of the drivershaft B, while its larger end is bored to an increased diameter, A. The sleeve 0, which may be cast of malleable iron, is cylindrical in form, and is preferably provided on its outer surface with axial ribs 0, beveled at the bottom to meet the circumference. This sleeve is bored or reamed at O to fit the end of the driver shaft B. The plug D fits the large here A of the handle.

In fastening the shaft to its handle the body of the former is pushed through the handle from the small end. The point of the shaft is then secured in a vise or otherwise, and the sleeve, which may be previously heated, if preferred, so as to slightly expand it, is driven tightly onto the end, where its contraction will assist in firmly uniting it. An acid may be used to produce rust for the same purpose. The sleeve, after being thus solidly connected to the shaft, is forced down into the large bore A of the handle, the projections O plowing Serial No. 267,664. (No model.)

axial grooves in which they tightly fit, and the body of the sleeve fitting snugly in the bore A. After being forced in to a proper distance, the plug D, preferably coated with glue, is pushed down against the top of the sleeve and finished off flush with the outside of the handle.

The body B of the shaft fits more or less closely in the small bore extending through the reduced part of the handle, while the ribs on its enlarged end being pressed tightly into the heavy part effectually prevent it from turning. The plug D holds it securely against the offset A in the bore of the handle and precludes the possibility of its being pushed out of the handle when the point of the shaft is pressed to its work. A positive union is thus effected and the strain is all conveyed to the heaviest and strongest part of the handle.

It is obvious that instead of driving the sleeve 0 upon the end of a plain shaft, as desired, the latter may be formed with an integral enlarged end adapted to be secured to the handle in substantially the same manner.

Neither must the body of the shaft nor the sleeve or integral enlargement of it necessarily be cylindrical in section, they being so set forth herein merely as preferred forms, with advantages in economy of construction, my method of uniting the handle and shaft being equally applicable to a rectangular section of the latter. The essential feature of my invent-ion consists in fitting the enlarged end of the shaft into the heavy part of the handle, so it cannot turn, and plugging the opening to keep it there.

What I desire to secure by Letters Patent are the following claims:

1. The method of uniting the handle and shaft of a screw-driver or similar tool, which consists in boring the handle throughout its length to two -diameters, forming the shaft with an enlarged shank with uneven surface, forcing said enlarged shank into the larger bore of the handle, the body of the shaft passing through the smaller bore and closing the opening of the larger bore, substantially as set forth.

2. The method of uniting the handle and 1 then closing the opening of the larger bore, 10 shaft of a screw-driver or similar tool, which substantially as set forth. consists in boring the handle throughout its In testimony \vhereofI flfllX my signature in length to two diameters, attaching a hollow presence of two witnesses.

\ sleeve with uneven outside surface to the shank l end of the shaft, forcing the sleeve into the i FELIX (lllAINlRlGLL. bore of the handle [rom one end, the shaft I it Witnesses: passing through a smaller bore of the handle I \VM. D. SUOMO,

and projecting from the opposite end, and I F. PIERCE HUMM'EL. 

